I think it depends on which version you have (i.e. how old it is). My Graupner is about 5 years old and if I remember correctly it will not charge Lithium Ion cells. I just bought a new Shultze (same company manufactures the Graupner) isl-6 and it will charge them.

Let me know what software version yours is running, if it is the same (or close to) what my Shultze is running I would bet that the instructions will be the same. It will be tomorrow before I can scan and send to you though.